Pyxos™ FT Network Chip
11500R
Introduction
The Pyxos platform is a high-speed sensor network
ideal both for stand-alone applications and the ones
extending LONWORKS® networks down to sensor and
actuator I/Os. It can be used inside machines and in other
high-performance systems.
Pyxos embedded control networks reduce product
installation, warranty, and life-cycle costs. Pyxos selforganizing networks reduce installation costs and equipment assembly time by eliminating the need to use special
tools or skilled labor for network configuration. This
minimizes material and labor costs. The remote diagnostics afforded by the Pyxos platform enable new features
that let manufacturers access low-level data from sensors
and actuators, such as process efficiency and energy usage.
Employing these features for preventive and predictive
maintenance provides reduced life-cycle costs and
improved customer service.
The Pyxos FT network chip embeds both the protocol
for a Pyxos platform and the transceiver for communicating on the Pyxos network. With the networking protocol
implemented inside the chip, only application development is left to the user. The chip has a small size (5mm x
5mm) that fits into virtually any sensor or actuator.
The chip can be connected directly to digital I/O without
a microcontroller, making for an ultra-compact smart
t Low-cost embedded control networking chip for use
inside machines and for extending control networks
to high-performance sensor networks
t Miniaturized form factor fits into almost every
sensor and actuator
t Extensible architecture for seamless integration
with LONWORKS® control networks and the Internet
t Self-organizing feature configures the network
without special tools or skilled labor
t High-speed deterministic operation (≤ 25ms
response time)
t 312.5kbps network transmission speed
t Polarity-insensitive, free topology, twisted pair
wiring
t Link power allows sending communication and
power over same pair of wires
t Robust performance ideal for industrial and consumer products and applications including automotive, buildings, office machines, and transportation
t Exceptional data integrity with forward error correction and 18-bit packet CRC
t Exceptionally high common mode noise and
interference immunity
t Network pins ESD protection to over 8kV HBM
t -40°C to +85°C operating temperature range
t 20 Pin QFN 5mm x 5mm package
t RoHS-compliant
device. Alternately, the chip's serial peripheral interface
(SPI) port can be interfaced with a wide variety of lowcost microcontrollers to accommodate more complex I/O
requirements.
Network Architecture and Components
A Pyxos FT network consists of up to 32 Pyxos Points
embedded inside sensors and actuators, and a Pyxos Pilot
to interface with the outside world or other Pyxos Pilots.
Points (Figure 2) can either be unhosted (without a micro-
Figure 1. Pyxos FT Transceiver Block Diagram
controller; with only digital I/Os) or hosted (with a microcontroller). Pilots (Figure 3) need a microcontroller and
can either be stand-alone (not connected to any external
network) or networked (connected to a higher-level external network e.g., LONWORKS to communicate with the
outside world or with other Pyxos Pilots).
Advanced Noise Immunity
Four different network coupling options are available
to cover a wide variety of application environments. For
applications within an enclosure, the differential receiver
in the Pyxos FT IC provides rail-to-rail common mode
range and may be connected directly to the network with
no additional components. For network applications
where AC mains based common mode noise may be tens
of volts, a simple 4 component coupling circuit provides
+/-40V 50/60Hz common mode range (far better than
typical RS-485 transceivers). For extremely harsh noise
environments a transformer coupled option provides a
common mode range of 277VAC at 50/60Hz and >50Vpp
immunity to higher frequency common mode noise passing the highest level of EN61000-4-6 conducted RF
immunity.
High Speed Deterministic Response Time
A Pyxos FT network operates at 312.5 kilobits per
second using a deterministic signaling method by which
all 32 Points in the system are scanned every 25 milliseconds (proportionally faster with fewer Points in the system). This rate of speed allows Pyxos FT networks to be
used for closed-loop controls in process and industrial
applications, as well as sensing and control applications
that require fast response time.
Potential applications include:
• vehicular controls
• fault monitors
• propulsion controls
• HVAC systems
• lighting systems
• burner and boiler controls
• security and fire/life
• elevator cab and floor call
safety devices
controls
• office automation equipment
Free Topology Wiring and Link Power
A Pyxos FT network sends both power and data on the
same wire pair, a feature known as "Link Power". Link
power eliminates the need for an additional pair of power
wires and interface terminals, further reducing the cost,
size, and complexity of Pyxos FT Points. Pyxos FT
2
networks support free topology wiring architecture that
allows network cabling in star, loop, daisy chain, or bus
topology or any combination of these. Free topology
wiring reduces the time and expense of device installation
by allowing the wiring to be installed in the most expeditious and cost-effective manner.
controllers (PLCs), data gathering panels, host processors, LONWORKS control networks, the Internet, and
beyond. The published API makes it easy to interface
with the Pyxos Pilot. The Pyxos API uses the same data
type definitions as those developed for LONWORKS networks, making integration with LONWORKS networks
seamless.
Seamless Integration with Outside World
Control information gathered from Pyxos FT Points is
disseminated by a Pyxos FT Pilot to programmable logic
Block Diagrams
Figure 2. Example Pyxos Point
Figure 3. Example Pyxos Pilot
3
SCLK/ DI4
3
MOSI/ DIO0
4
MISO/ DIO1
5
VDD3
2
GND
INT~/ DIO3
GND
1
RST~
CS~/ DIO2
JOIN/ MD
Pin Configuration
20
19
18
17
16
15
®
NET_A
14
GND
13
NET_B
12
VDD3
11
VBIAS
6
7
8
9
10
COUT
GND
XIN
XOUT
ATEST
PYXOS™ FT
Note: There is an exposed die paddle (Pin 21) on the underside of
the chip package. This must not be connected to any voltage or
signal line on the PCB.
Name
Pin Number
1
CS~/ DIO2
INT~/ DIO3
2
3
SCLK/ DI4
MOSI/ DIO0
4
MISO/ DIO1
5
COUT
6
GND
7
XIN
8
XOUT
9
ATEST
10
VBIAS
11
VDD3
12
NET_B
13
GND
14
NET_A
15
VDD3
16
GND
17
GND
18
RST~
19
JOIN/MD
20
PAD
21
Type
Digital I/O
Digital I/O
Digital In
Digital I/O
Digital I/O
Digital Out
Ground
Osc In
Osc Out
Analog I/O
Analog Out
Power
Analog I/O
Ground
Analog I/O
Power
Ground
Ground
Digital I/O
Digital In
Do Not Connect
Pin Description
Chip Select Input or DIO2
Interrupt Output or DIO3
SPI Clock Input or DI4
SPI Input or DIO0
SPI Output or DIO1
Clock output/tri-state
Ground
Crystal Oscillator In
Crystal Oscillator Out
Analog Test
Network Bias Voltage Output
3.3V Power
Network TX/RX
Ground
Network TX/RX
3.3V Power
Ground
Ground
Reset Input/Output
Join/Mode pin Input
Do Not Connect
Pad Layout
The center pad in the pad layout is connected to ground. However, the solder stencil mask isolates the center pad on the
PCB from the exposed die paddle on the underside of the chip.
4
Package Diagrams
5
General Specifications
Features
Network Connections
Protocol
Response Time (reading and writing
two 4-byte values in each scan)
Data Integrity
MAC ID
Installation
Description
Polarity-insensitive
Deterministic TDM protocol with automatic retries on CRC error
≤25ms scan time for up to 32 Points. Scan time is proportionally faster
with less Pyxos Points, e.g., 1.8ms for two Pyxos Points in the system
Forward error correction of up to 2 bit errors per packet; 18 bit packet CRC
Built-in
Self-organizing network with automatic, hardwired, or manual service-pin
methods
Maximum Pyxos Points per Pyxos Pilot
32
Transmission Speed
312.5 kilobits per second, fixed polling cycle
Pyxos Network Variables (PNVs)
Up to 128 PNVs per Pyxos Point. A maximum of 512 bytes may be used
per hosted Pyxos Point
for PNVs, with memory allocated in 32-bit increments. A PNV may be
1 to 32 bytes.
LONWORKS Network Variables per Pyxos Pilot 62 when using ShortStack, 4096 when using MIP
Network Wiring
Unshielded CAT-5 24AWG (0.5mm) and Belden 8471 16AWG (1.3mm)
twisted pair wire; see Junction Box and Wiring Guidelines application
note for cable details
Network Length in Free Topology
Free Topology (Single termination): 100m (328 feet) maximum total wire
Bus Topology (Double termination): 400m (1312 feet) maximum;
0.3m (1 foot) maximum stub lengths
Link Power
Supports 24VAC or 24VDC link power with optional external components; reference designs provided for both switching and linear power
supplies
Application Output Current: up to 100mA @ 3.3V DC
Coupling Options
Direct Connect (for applications within a single enclosure)
Non-isolated/Grounded
Non-isolated/Floating
Transformer-isolated (very high common mode and interference
immunity)
EMI
Designed to comply with FCC Part 15 Level A and EN55022 Level A
ESD
Designed to comply with 61000-4-2 Level 4 (contact - 8kV; air - 15kV)
ESD Human Body Model (MIL-STD-883)
8kV
(for pins NET_A and NET_B)
Radiated Electromagnetic Susceptibility
Designed to comply with 61000-4-3 Level 3 (10V/m)
Fast Transient/Burst Immunity
Designed to comply with 61000-4-4 Level 4 (2kV)
Surge Immunity
Designed to comply with 61000-4-5 Level 3 (2kV)
Conducted RF Immunity
Designed to comply with 61000-4-6 Level 3 (10Vrms)
Common Mode Range (0 – 60Hz)
277Vrms with Transformer-isolated coupling
+/-40V with Non-isolated/Grounded coupling
I/O
4 digital I/Os and 1 digital input without a microcontroller (unhosted),
8mA drive, 5V tolerant for LEDs, digital I/O, and transistors
Pyxos Host Microcontroller Interface
SPI (Serial Peripheral Interface)
Package
20 Pin QFN 5mm x 5mm package
Operating Voltage
3.3V ±10%
Operating Temperature
-40ºC to +85ºC
6
Ordering Information
Echelon Product
Pyxos FT Communication IC
Pyxos FT Communication IC Samples (Qty 5)
Pyxos FT Evaluation Kit
Echelon Model Number
11500R-300 (Dry Pack of Five Tubes)
11500R-5000 (Tape and Reel Package)
11500R-ES
11000R-10-1P
Non-Echelon Product
Network Isolation Coupling Transformer*
Switching Power Supply Transformer*
Model Number
TMS80040CS
TMS60563CS
* Available from:
Transtek Magnetics
1900 W. Grant Road
Tuscon, AZ, USA 85745
(800) 378 0015
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Panoramix, Panoramix Powered by Echelon, LonMaker, the Echelon logo, and the LonUsers logo are trademarks of Echelon Corporation registered in the United States and other countries. Pyxos, LonLink, LonResponse,
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Echelon, and Thinking Inside the Box are trademarks of Echelon Corporation. Other trademarks belong to their respective holders.
DISCLAIMER
PYXOS FT CHIPS, NEURON CHIPS, FREE TOPOLOGY TWISTED PAIR TRANSCEIVER MODULES, AND OTHER OEM PRODUCTS WERE NOT DESIGNED FOR USE IN EQUIPMENT OR SYSTEMS INTENDED FOR
SURGICAL IMPLANT INTO THE BODY, OR OTHER APPLICATIONS INTENDED TO SUPPORT OR SUSTAIN LIFE, FOR USE IN FLIGHT CONTROL OR ENGINE CONTROL EQUIPMENT WITHIN AN AIRCRAFT, OR FOR ANY
OTHER APPLICATION THAT INVOLVES DANGER TO HUMAN HEALTH OR SAFETY OR A RISK OF PROPERTY DAMAGE. ECHELON ASSUMES NO RESPONSIBILITY OR LIABILITY FOR USE OF THE PYXOS FT CHIPS,
NEURON CHIPS OR FREE TOPOLOGY TWISTED PAIR TRANSCEIVER MODULES IN SUCH APPLICATIONS. ECHELON SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A
PARTICULAR PURPOSE. ECHELON SHALL NOT BE LIABLE TO ANY USER OF THE PYXOS FT CHIPS, NEURON CHIPS, OR FREE TOPOLOGY TWISTED PAIR TRANSCEIVER MODULES FOR ANY LOST PROFITS OR
OTHER SPECIAL, CONSEQUENTIAL, INDIRECT, PUNITIVE OR INCIDENTAL DAMAGES, HOWEVER CAUSED ON ANY THEORY OF LIABILITY, ARISING IN ANY WAY OUT OF THE DEVELOPMENT OR DISTRIBUTION OF
APPLICATIONS OR SYSTEMS USING SUCH PRODUCTS.
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